Brush-holder.



' J. C. LINCOLN.

BRUSH HOLDER.

APPLIGATION FILED JULY 19, 1911.

Patented Mar. 17, 1914.

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JOHN '0. LINCOLN, 0F CLEVELAND, OHIO.

BRUSH-HOLDER.

following is a specification, the principle of y the invention beingherein explained and the best mode in which I have contemplated applyingthat principle, so as to distinguish vit from other inventions.

My invention relatesto a brush-holder, and more particularly to anadjustable feature in conjunction with improved details of construction.

The object is the provision of a device of this general character which,while entirely simple and economical of manufacture, will neverthelessinsure increased efliciency.

The said invention consists of means which are hereinafter fullydescribed and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detailcertain means embodying my invention, the disclosed means, however,constituting but one of various mechanical forms in which the principleof my invention may be applied.-

In said annexed drawings Figure l is a side view of a brush-holderembodying my invention. Fig. 2 is a top plan of one extremity thereof.Fig. 3 is a section on line III-III of Fig. 2, looking in the directionof the arrows. Fig. 4 is a perspective view'of one detail.

The construction comprises a primary supporting yoke A which isconcentric with and supported by means of a set-screw a to thecommutator B. The yoke comprises, for the purposes of illustration inthis instance, two diametri'cally opposite extensions a2, each of whichis provided with an open rectangular slot a3. A pair of exactly similarsupporting brackets C are fixedly secured in these slots through themedium of the .vashers c and nuts o2.

In the course of the subsequent llescription by reason of the fact thatthe individual brackets are identical, only one will be described, andhence but one such bracket will be hereafter referred to. This bracketis thoroughly insulated from the yoke by means of the insulation Dinterposed on either side of the yoke, and the insulation D Serial No.639,433.

disposed within the slot a3, as best seen iu Fig. 2. v

The bracket C projects forwardly across the comlnutator, and is formedwith a rec tangular radially disposed socket opening c3. Extending fromthe bracket, and as shown contiguous the central portion of the socketopening o3 is an arm c4. This arm is provided near its extremity with atransverse plain opening c5 and also with a second plain oipening cperpendicular to and intersecting t is opening-as very clearly seen inFig. 3. A stud E extends through the opening c5, and is provided thereinwith a depressed worm-threaded portion c. This stud projects on eitherside of such opening, and is provided in each of its ends with a flatopen slot e2 clearly appearing in Fifrs. 2' and 4. An adjusting screw Fis normaly seatedin the opening c6, and by reason of the intersection ofthis opening with the opening c5 is adapted to mesh with the wormthreads e, as clearly seen in Fig. 3. It will accordingly be apparentthat a rotation imparted to the adjusting screw Fv will be transmitted.to the stud E.

A pair of carbon brushes G having a contact area ample for the currentto be commustud E and have their inner ends 7: iixedly secured in theslots e2. These springs K have their outer free extremities k2 normallybearing against the outer ends of the carbon brushes G, as most clearlyappearing in Fig. 2. It should now be obvious that when the rotation ofthe adjusting screw F is im'- parted to the rotatable stud E, the latterwill tend to either increase or diminish the degree of tension existingin the spiral springs K, and accordingly the degree of pressure exertedupon the outer ends of the carbon brushes. Accordingly an adjustingfeature of my brush-holder is provided through the simple manipulationof a single screw, whereby the pressure upon the brushes 4may beregulated to be practically uniform throughout their efficient use.

As will be readily appreciated by those Specification of Letters Patent.Patented M31', 17, 1914,

- Application ledJuly 19, 1911.

suhciently skilled in the art, the tension in the spiral springs K maybe increased by a forward turning-of the screw F, and the tendency ofsuch springs to uncoil and occasion a reverse movement be mechanicallyprecluded. Furthermore, by'reason or' the fact that the Worin-threadedportion e of the stud E is depressed Within its peripherical surface,this mechanical preclusion is found applicable also as against anytendency of the stud to move in the direction oi' its oWn axis.

Having fully described my invention, what l claim and desire to secureby Letters Patent is 1. A brushholder comprising a bracket having aplain opening, a brush inovably s-ecured to said bracket, a studrotatably mounted in said opening and provided therein With aWorm-threaded portion, such portion beingdepressed Within theperipherioalsurface, a spiral spring; secured to said stud and havingits free end bearing;

:nomme against said brush, and means comprisin a screw in mesh with suchWorm-three ed portion and adapted to adjust said stud.

2. ln a brush-holder, an arm provided with a plain transverse bore oropening, a cylindrical stud mounted in said openin as a bearing, thatportion of said stud Wit. in said opening bein provided with Wormwheelthreads; said arm being provided with a second plain opening or boreintersecting said v{irst named opening or bore; a Worm screw looselymounted in said second opening or bore and engaging the threads of vsaidstud; and two spiral springs having their inner` ends securedrespectively to op posite ends or said stud, the opposite en s of saidsprings being adapted to bear upon the brusl Signed by me, this 17th dayof July, 191.1.

JOHN C. LINCOLN.

Attested by- CURT B. MUELLER l/VINIFRED FLEMING.

